Abstract
This paper reports how the spectral linewidths of plasmon resonances can be narrowed down to a few nanometers by optimizing the morphology, surface roughness, and crystallinity of metal nanoparticles (NPs) in two-dimensional (2D) lattices. We developed thermal annealing procedures to achieve ultranarrow surface lattice resonances (SLRs) with full-width at half-maxima linewidths as narrow as 4 nm from arrays of Au, Ag, Al, and Cu NPs. Besides annealing, we developed a chemical vapor deposition process to use Cu NPs as catalytic substrates for graphene growth. Graphene-encapsulated Cu NPs showed the narrowest SLR linewidths (2 nm) andwere stable for months. These ultranarrow SLR nanocavity modes supported even narrower lasing emission spectra and high nonlinearity in the input- output light-light curves.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 23380-23384 |
| Number of pages | 5 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Volume | 117 |
| Issue number | 38 |
| DOIs | |
| State | Published - Sep 22 2020 |
Funding
This work was supported by the Vannevar Bush Faculty Fellowship from the US Department of Defense (Grant N00014-17-1- 3023). This work used the Northwestern University Micro/Nano Fabrication Facility, which is partially supported by Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF Grant ECCS-1542205), the Materials Research Science and Engineering Center (Grant DMR-1720139), the State of Illinois, and Northwestern University. Samples were characterized using the Electron Probe Instrumentation Center and Scanned Probe Imaging and Development facilities of Northwestern University's NUANCE Center, which has received support from the SHyNE Resource; the Materials Research Science and Engineering Center program (Grant NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. The annealing process was performed in AS-Micro rapid thermal processor in Materials Processing and Microfabrication Facility at Northwestern University. The CVD treatments were conducted in Berry Research Laboratory at University of Illinois at Chicago. ACKNOWLEDGMENTS. This work was supported by the Vannevar Bush Faculty Fellowship from the US Department of Defense (Grant N00014-17-1-3023). This work used the Northwestern University Micro/Nano Fabrication Facility, which is partially supported by Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF Grant ECCS-1542205), the Materials Research Science and Engineering Center (Grant DMR-1720139), the State of Illinois, and Northwestern University. Samples were characterized using the Electron Probe Instrumentation Center and Scanned Probe Imaging and Development facilities of Northwestern University\u2019s NUANCE Center, which has received support from the SHyNE Resource; the Materials Research Science and Engineering Center program (Grant NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. The annealing process was performed in AS-Micro rapid thermal processor in Materials Processing and Microfabrication Facility at Northwestern University. The CVD treatments were conducted in Berry Research Laboratory at University of Illinois at Chicago.
Keywords
- Lattice plasmons
- Nanolasing
- Quality factor
- Surface lattice resonances
- Thermal annealing
ASJC Scopus subject areas
- General